Pen



FIG. 1 is a bottom front right perspective view of a first embodiment of a pen in accordance with my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a top, left, rear perspective view thereof. 

CLAIM The ornamental design for a pen, as shown and described. 